Sign display



FIG. 1 is a front elevational view of a sign display, showing my new design;

FIG. 2 is a plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a perspective view thereof.

The broken line disclosure of the indicia in FIGS. 1 and 4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a sign display, as shown and described. 